In this fantasy realm, the mightiest dragon family rules supreme while the least powerful young woman resides in their domain under a specific lord. Despite her mundane existence, Haru discovers that her mother had concealed a precious gemstone within the borders of the dragon kingdom - an extremely rare artifact. Once she learns about this secret, her life takes on a whole new dimension. Haru encounters a baby dragon and is confronted by a mysterious man in black attire. What does this imply for her ordinary existence?